棲蘭山林區柳杉人工林行列疏伐營造複層林之研究

Establishment of a Cryptomeria-based Multi-storied Plantation by Row Thinning

羅卓振南(Chen-Nan Lo-Cho) ； 鍾旭和(Hsu-Ho Chung) ； 邱志明(Chih-Ming Chiu) ； 黃進睦(Chin-Mu Huang)

《台灣林業科學》 12卷4期 (1997/12) Pp. 459-465

https://doi.org/10.7075/TJFS.199712.0459

摘要

本研究探討進行大面積柳杉人工林之林相改良以營建複層林之方式。供試林分為太平山事業區第20林班24年生柳杉人工林，經施以行列疏伐後進行複層林營造。疏伐方式計分為砍2行留6行；砍3行留6行；砍4行留6行：砍5行留6行。疏伐後砍伐帶內栽植高經濟價值之鄉土樹種，計有台灣扁柏、紅檜、香杉及台灣杉等4種。栽植6年後，不同處理之造林木成活率約為90%，其中以栽植於砍伐帶寬為3行～5行者其生長較佳。就不同樹種之平均胸徑及樹高生長而言，則以香杉和台灣杉之生長較快，其次為紅檜，而台灣扁柏之生長較慢。林內之相對光度與疏伐帶寬成正比。其相對光度均值在砍伐帶5行者為64%，而其他砍伐帶為4行、3行及2行者則分別約為60%、56%及46%。本研究栽植之台灣杉及香杉2樹種均曾發生風折及風倒之為害，而香杉除風害外，尚有31%木遭松鼠為害。

關鍵字

行列疏伐 ； 複層林

並列摘要

A silviculture study on large scale improvements of a man-made cryptomeria (Cryptomeria japonica) forest was done to establish a multi-storied plantation. Row thinning followed by planting practices was carried out in a 24-yr-old cryptomeria forest located at Compartment No. 20, Taipingshan Working Circle of Chilanshan. Four row thinning treatments of strip cutting of 2 rows, 3 rows, 4 rows, and 5 rows, respectively, were applied. For these 4 treatments, 6 rows of 4 trees were retained on both sides of the cut strips. After thinning, seedlings of 4 valuable endogenous species, Taiwan hinoki (Chamaecyparis obtusa), Taiwan red false-cypress (Chamaecyparis formosensis), Formosan China-fir (Cunninghamia konishii), and Taiwania (Taiwania cryptomerioides), were planted in the cut strips. Six years after planting, survival rates of the 4 tree species were more than 90%, and trees planted on strips wider than 8 m grew faster than did the others. Among the 4 tree species, Formosan China-fir and Taiwania performed better in terms of height and diameter growth, followed by Taiwan red false-cypress and Taiwan hinoki, respectively. The relative light intensity (RLI) measured in the cut strip was found to be proportional to the width of the strip. The RLI in the cut strip of 5 rows was about 64%, whereas those measured in strips of 4 rows, 3 rows, and 2 rows were 60%, 56%, and 46%, respectively. Wind damage occuring on trees of Taiwania and Formosan China-fir was observed, and 31% of Formosan China-fir trees were also damaged by squirrels.

並列關鍵字

row thinning ； multi-storied plantation